Mom's Prize-Winning Low-Carb Zucchini Casserole Recipe

zucchini casserole
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Total Time 60 min
Prep 20 min, Cook 40 min
Yield 9 servings Zucchini Casserole

My mother's original recipe of this zucchini casserole won an award in the 1960s -- we had a plaque hanging in our kitchen. Hers had bread crumbs, which absorbed some of the juices.

To make it low-carb friendly, I start the casserole on a higher heat to dry it out a bit, and then add the last of the cheese on the top (otherwise it gets too brown or could even burn). This works with any kind of zucchini or green summer squash, including a combination of squashes.


  • Sauce:
  • 1 tablespoon olive oil
  • 1/3 cup chopped onion (about 1/2 of a medium onion)
  • 3 cloves garlic
  • 3/4 pound tomatoes (fresh or canned -- about a 1-pound can of whole tomatoes, drained)
  • 1 teaspoon Italian herbs or oregano
  • Salt and pepper
  • Zucchini and Cheese:
  • 1 pound zucchini (approximately 2 medium)
  • 1 cup grated Italian cheese mixture (packaged, or a mix including, for example, mozzarella, Parmesan, provolone)


  1. Heat oven to 400 degrees F.
  2. Heat the olive oil in a medium saucepan.  Sauté the onion in the oil for 2 to 3 minutes, then add the garlic and cook for another 30-60 seconds, until the garlic is fragrant. 
  3. Cut each tomato into 3 to 5 pieces and add to the oil, along with the herbs, salt, and pepper.
  4. Cook over medium heat until the liquid is mostly gone (but not dry), stirring occasionally -- you should end up without about 1 cup of the mixture. This should take about 5 to 10 minutes.
  1. Meanwhile, cut the zucchini into slices approximately 1/4 inch thick. These can be either round slices, or lengthwise. Take the largest slices and line the bottom of a 9x9-inch or 8x8-inch pan, or a similarly-sized round pan.
  2. Spread about 1/4 of the tomatoes on top of  the zucchini (don't even try to spread evenly; it won't work), followed by 1/4 cup of the cheese.
  3. Continue layering the sauce, zucchini and cheese. It should come out to four layers, but if it only makes three, just try to divide things relatively evenly. Don't put the final layer of cheese on yet.
  4. Bake for 20 minutes. Top with the rest of the cheese, and lower the temperature to 375 degrees F. Bake for about 20 more minutes, or until the cheese is golden brown.

Makes 9 servings on the small side

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